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|Title:||Large femtosecond two-photon absorption cross sections of fullerosome vesicle nanostructures derived from a highly photoresponsive amphiphilic C 60-light-harvesting fluorene dyad|
|Source:||Wang, M., Nalla, V., Jeon, S., Mamidala, V., Ji, W., Tan, L.-S., Cooper, T., Chiang, L.Y. (2011-09-29). Large femtosecond two-photon absorption cross sections of fullerosome vesicle nanostructures derived from a highly photoresponsive amphiphilic C 60-light-harvesting fluorene dyad. Journal of Physical Chemistry C 115 (38) : 18552-18559. ScholarBank@NUS Repository. https://doi.org/10.1021/jp207047k|
|Abstract:||We demonstrated ultrafast femtosecond nonlinear optical (NLO) absorption characteristics of bilayered fullerosome vesicle nanostructures derived from molecular self-assembly of amphiphilic oligo(ethylene glycolated) C 60-(light-harvesting diphenylaminofluorene antenna). Fullerene conjugates were designed to enhance photoresponse in a femtosecond time scale by applying an isomerizable periconjugation linker between the C60 cage and a diphenylaminofluorene antenna subunit in an intramolecular contact distance of only DPAF-EG 12C1)-based fullerosome nanovesicles in H2O was characterized to consist of a bilayered shell with a sphere diameter of 20-70 nm and a chromophore shell width of 9.0-10 nm, fitting well with a head-to-head packing configuration of the molecular length. At the estimated effective nanovesicle concentration as low as 5.5 × 10-8 MV (molecular molar concentration of 5.0 × 10-4 M) in H2O, two-photon absorption (2PA) phenomena were found to be the dominating photophysical events showing a large molar concentration-insensitive 2PA cross-section value equivalent to 8500 GM in a form of nanovesicles, on average. The observed NLO characteristics led to a sharp trend of efficient light-transmittance intensity reduction at the input laser intensity above 100 GW/cm2. © 2011 American Chemical Society.|
|Source Title:||Journal of Physical Chemistry C|
|Appears in Collections:||Staff Publications|
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